The German car automaker, BMW, revealed on Tuesday the Motorrad Vision DC Roadster, an electric version of its two-cylinder
motorbike which has been produced by the German company since the 1920s, however, BMW has swapped out its much-loved engine for an electrified battery pack.
The engine's Tripower system adopts three-step sliding camshafts to allow shifting between three distinct operating modes-four-cylinder performance mode; four-cylinder eco mode; and two-cylinder
super-eco mode, in accordance with output requirements.
It's not a new idea by any means but Mazda says the new four-cylinder power unit seamlessly switches between four and two-cylinder
operation at speeds between 25 and 50mph to improve real-world fuel economy at no cost to performance.
In Section 3, attenuation models by a human body including KE and UTD one-cylinder and UTD two-cylinder
models as well as the attenuation model by trees in ITU-R P-833-8 are investigated.
In the range extender, which is fitted with a 647cc two-cylinder
petrol engine to generate more power, it also reduces CO2 emissions to 12g/km - the equivalent of 470.8mpg from a diesel car.
WITH its innovative two-cylinder
petrol engine, Fiat's 500 TwinAir has always been notably frugal and clean in 85bhp guise.
The new two-cylinder
TwinAir engine uses a highefficiency turbocharger, an exhaust manifold integrated into the cylinder head, a Start&Stop fuel-saving system and a new intake valve control system to provide an even more enticing combination of power and efficiency.
There is also an engine start-stop system which cuts in when the cars are waiting at traffic lights and junctions because no-cylinder operation is even more efficient than two-cylinder
operation is also disengaged if the driver brakes, enabling all four cylinders to support braking when coasting, and if the car is travelling downhill.
The XL1, a plug-in hybrid with an electric motor and two-cylinder
diesel engine, has 69 horsepower on tap.
It uses a 48-hp two-cylinder
, 0.8-liter common rail turbodiesel, a seven-speed DSG dual-clutch gearbox, and 20-kW (27-hp) electric motor (see: autofieldguide.com/articles/ volkswagen-goes-common--but-with-a-difference).